Product suggestion
I like to play both limited and constructed. But to reach mythic in limited you have to pout in a lot more time than in constructed and for us that have full time job and kid it's just unnessesary to put in time at all in limited since i don't have tim to reach mythic top 1200 anyway.
Because of this it would be a fantastic idé to choose a 3rd ranking that is called "Mixed". Where you can play everything but the ranking goes up on the mix and not in the constructed or limited alone. (But still being able to play against an opponent that donät chhosed mixed). If you would hade this 3rd choice on Arena people that don't have all the time in the world could still be able to play both limited and constructed and at the same time being able to reach mythic.
I think this is the best idea many people have read about so you should implement this in Arena as soon as you can.